Power-crane.



s. J. WEBB, POWER CRANE.

APPLIOATION FILED OQT. 26,1907.

Patented June 22, 1909.

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iro-Lamas v 1 .m M w 2 9 9w 2 M \flk n [J 2 6 m M u u v G 6 =3 0 N 2 S. J. WEBB.

-10W'ER CRANE.

APPLIOATION FILED 001226, 1901.

925,968. Patented June 22, 1909.

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l SAMUEL J.-WEBB, OF MINDEN, LOUISIANA.

' POWER-GRAN E.

To all whom it"inay concern:

Beit known that I," SAMUEL J. WEBB, a citizen of the United States, and resident of Minden, Webster parish, State of Louisiana, have invented; certain new and useful Improvements in Power-Cranes, of which the following is a specification.

My invention relates to cranes and more especially to swinging cranes of that class which are used in loading and unloadin car trucks and especially for. raising an lowering cotton bales, although the improvements may be employed in connection with other classes of cranes, and consists in the arrangement of a jib, generally having two converging members in relation to a motor occupying a fixed position, and of certain details of construction as fully set forth hereinafter and illustrated in the accompanying drawing, in which:

Figure 1 is a sectional elevation showing a crane embodyin my improvements; Figs. 2 and 3 the same s owing a somewhat different arrangement of the parts; and Fig. 4 the same illustrating the application of an electrical motor. Fig. 5 is a detail plan.

The crane is provided with a suitable jib A which is hin ed to a standard or support X, which may Fe fixed or portable, and consists of a post or beam, or the wall of the structure. As shown the jib has two members 1 and 2, the member 1 being a thrust member and the member 2 a tension member preferably consisting of one or more rods.

The members are jointed or hinged to the standard at difierent, separated points, in vertical line with each other, but are connected at their outer ends preferably by'a union block 3 which is slotted to receive a guide pulley 7. One of the members, either the tension member 2 (Figs. 1, 2 and 3) or the thrust member 1 '(Fig. 4) is suitably supported as by a slotted bracket 5 and inner guide pulley 6.

To thestandard X is fixed a motor M of any suitable character to operate a hoisting cable y which asses from the motor over both pulleys an is provided with a suitable engaging device at the end, as a hook or grap le 9. The motor is provided with a suita 1e control device as a valve device B or switch 'B, and flexible connections may extend' from this device to hand-holds 12 at the outer end of the jib, or to circuit-makers Specification of Letters Patent.

Application filed October 26, 1907.

Patented June 22, 1909.

Serial No. 399,828. I

As shown in Figs. 1, 2 and 3, the motor has a cylinder 14, piston 15 and piston-rod 16 to which one end of a cable is attached, and a suitable motor fluid may be admitted to or exhausted from either end of the cylinder by operating the control valve B, and the pulley 6 is so arranged that the vertical section of the hoisting cable will be in line with the piston-rod and with the pivots of the jib, or the latter in line with the point where the cable passes from the motor so that the swinging of the jib does not lift or lower the weight.

Toprevent injury in case of breaking of the chain or slipping of the rod in hoisting, or too rapid descent of the load, I provide a buffer at each end of the cylinder by forming a pocket 4) in each cylinder head adapted to receive a projection 22 on the pie this motor may be connected by flexible 0011- nections 20 passing over suitable guide leys with hand-holds 21 at the outer en the jib permitting the o erator to control the motor N from this point. As shown the motor has a cylinder, piston, piston-rod and a rack 25 connected with the rod, and engaging a toothed wheel 23 connected with the ib. An electric motor may be used for this purpose with electric control devices. The motor may be below the jib as in Figs. 1 and 2, or above it as in Fig. 3, or between the members thereof as in Fig. 4.

Without limiting myself to the precise construction and arrangement of parts shown, I claim:

1. In a power crane an upright or stand- I ard, a jib having two members each pivoted at one end adjacent to the standard and connected at the outer ends, and a motoralso supported by the standard, with its axis in line with the pivots of the jib guide pulleys on the jib and a cable passing from the motor over said pulleys.

2. In a power crane an upright or standard, a jib having two diver ing members connected together at one en and pivoted at the other to the standard, a motor also supported by the standard. consisting of a cylinder, piston, ,piston-rod, the latter in line with the pivots of the jib and means for admitting pressure fluid to and exhausting it from each end of the cylinder.-

3: A power cranehaving an upright or standard, a swinging jib, guide pulleys-thereon, a motor fixed to the standard, with its axis in line with the pivots of the jib a cable passing from the motor over said guide pulleys, and means for controlling the motor from the outer end of the jib.

4. The combination in a power crane of a standard, a jib consisting of two diverging members each hinged at one end to'the standard, a union block connecting them together at the opposite end and supporting a pulley, a bracket connected to the inner end of one of the members and a pulley carried thereby, a motor, with its axis in line with the hinges of the jib and a hoisting cable extending therefrom over said pulleys.

5. The combination in a power crane of a standard, a motor supported thereby, a hoisting cable connected to be operated by the motor, a jib' pivoted to the standard,'its pivots in line with the axis of the motor pulleys upon the jib, and a cable extending over said pulleys.

6. The. combination in a power crane of a standard, a jib hinged thereto, a motor supported by the standard with its axis in.

line with the hinges of the jib and having a cylinder, piston, piston-rod and control device, a cable connected to the piston-rod, and guide pulleys for the cable supported by the jib, the inner pulley in position to support the inner portion of the cable in jib pivoted to the standard and provided with guide pulleys, a motor connected to the standard and a cable extending from the motor over said pulleys, the vertical portion of the cablein line with the ivots of the jib.

8. The combination with the standard, swinging jib. and guide pulleys thereon, of

a motor supported by the standard and pro- 1 vided with a cylinder, piston and piston-rod, the heads of the cylinder having pockets and the piston provided with projections for the purpose specified.

9. The combination with the standard, jib hinged therto, guide pulleys onthe jib, a motor secured to thestandard, a cable connected to be operated by the motor and extending over the swinging the jib.

10. The combination with the standard,

pulleys, and a motor for jib hinged therto, guide pulleys on the jib,

a motor secured to the standard, a cable connected to be operated by the motor and extending over the pulleys, a motor for swinging the jib provided with a control device, and means extending to the outer end of the jib foroperating said control device.

In testimony whereof I afiix my signature in presence of two witnesses. i

I SAMUEL J. WEBB. Witnesses:

CHARLES E. FOSTER, J. A. WATSON. 

